We found one dictionary that defines the word missile defense systems:

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1. missile defense systems: Vocabulary.com

(Note: See missile_defense_system as well.)

Definitions from WordNet (missile defense system) ▸ noun:  naval weaponry providing a defense system ▸ Also see missile_defense_system ▸ Words similar to missile defense systems ▸ Usage examples for missile defense systems ▸ Idioms related to missile defense systems ▸ Wikipedia articles (New!) ▸ Words that often appear near missile defense systems ▸ Rhymes of missile defense systems ▸ Invented words related to missile defense systems